Pick the Mac up, told brothers, "Back up," the Mac spit
Lead was hitting niggas, one ran, I made him backflip

from Nas – N.Y. State of Mind Lyrics on Rap Genius

Meaning

Once he gets his gun, Nas tells his buddies to step back before opening fire on the rival crew. One of the crew tries to run, but Nas shoots him in the FRONT, with a velocity which makes him back flip before landing.

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